Daikin UATYA-B, Operation Manual

Page: 91 / 126

91
Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.2 Unit alarms
4.2.1 Air flow alarm
The air flow test is performed using either a mechanical differential or a differential pressure transducer.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PAL115 5.0 Pa Constant flow rate - Differential flow switch - Alarm threshold
PAL116 15 s Constant flow rate - Differential flow switch - Alarm delay upon fan start-up
PAL118 5 s Constant flow rate - Differential flow switch - Alarm delay at steady state
Air flow alarm from differential pressure transducer
Alarm code AL5
Reason for activation
When the pressure value measured by the differential pressure transducer is lower than
the setpoint in parameter “PAL115” after delay “PAL116” upon unit start-up or “PAL118” at
steady state
Reset mode Manual
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
All devices The controller stops the operation of the unit.
4.2.2 Dirty filters alarm
Alarm code AL14
Reason for activation
With the unit running, upon opening of the digital input to which the relevant safety device is
connected
Reset When the relevant digital input closes
Reset mode Automatic
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
All devices They follow their control
4 Alarms